Development of a heavy ion beam probe for measuring electrostatic potential profile and its fluctuation in LHD

Takeshi Ido, Akihiro Shimizu, Masaki Nishiura, Haruhisa Nakano, Shinji Kato, Shinsuke Ohshima, Yasuo Yoshimura, Shin Kubo, Takashi Shimozuma, Hiroe Igami, Hiromi Takahashi, Kazuo Toi, Fumitake Watanabe, Kazumichi Narihara, Ichihiro Yamada

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10 Citations (Scopus)

Abstract

A heavy ion beam probe (HIBP) using a 3-MV tandem accelerator has been installed on large helical device (LHD). Electrostatic potential in core plasma can be measured under the toroidal magnetic field strength of up to 3 T. By using the HIBP, the transition of potential profiles from electron-root to ion-root is observed in core plasmas during ramp-up of the electron density. Potential fluctuations are also measured electron cyclotron current drive (ECCD). Two kind of characteristic fluctuations are observed. One is a reversed-shear-induced Alfvén eigenmode (RSAE), whose frequency varies during the evolution of the rotational transform profile, and the other is with a constant geodeisc acoustic mode (GAM) frequency.

Original languageEnglish
Pages (from-to)460-464
Number of pages5
JournalPlasma Science and Technology
Volume11
Issue number4
DOIs
Publication statusPublished - Nov 17 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Ido, T., Shimizu, A., Nishiura, M., Nakano, H., Kato, S., Ohshima, S., Yoshimura, Y., Kubo, S., Shimozuma, T., Igami, H., Takahashi, H., Toi, K., Watanabe, F., Narihara, K., & Yamada, I. (2009). Development of a heavy ion beam probe for measuring electrostatic potential profile and its fluctuation in LHD. Plasma Science and Technology, 11(4), 460-464. https://doi.org/10.1088/1009-0630/11/4/19